JP2013002313A - Blower with sound attenuation box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that maintainability of a belt, an inverter and a plurality of fan units in a narrow space in a ceiling is low because the rotation speed of an impeller is increased by belt driving or inverter control, or the two fan units are horizontally disposed in one machine body, when a conventional blower with a sound attenuation box greatly increases the quantity of air.SOLUTION: A centrifugal blower 11 having the impeller 9 directly connected to a rotating shaft of a motor 10, and the inverter 13 for driving the motor 10 are provided inside the machine body 8. In the machine body 8, an opening 6 for maintenance is provided on a lateral surface on the same side with respect to the impeller 9. The inverter 13 is housed in an inverter box 14 which is mounted on a lateral surface positioned on the side of a machine-body supply opening 2 with respect to the motor 10 and provided with the opening 6 for maintenance. Thus, durability is enhanced while workability and the maintainability are improved.

Description

  The present invention relates to an inverter fixing structure for a blower with a sound deadening box used by incorporating a blower inside a sound deadening box such as a ventilation blower.

  In the conventional blower with a sound deadening box, when the air volume is greatly increased, the rotational speed of the impeller is increased by belt driving, the rotational speed of the impeller is increased by inverter control, or two in one airframe. The fan unit was placed horizontally.

(Conventional example 1)
A conventional fan with a sound deadening box has been known in which the rotational speed of an impeller is increased by driving a belt to increase the air volume. (For example, refer to Patent Document 1).

  The conventional example will be described below with reference to FIG.

  As shown in FIG. 4, the airframe suction port 101 and the airframe outlet 102 are provided on opposite side surfaces of the box-shaped airframe 103, and the airframe 103 has a suction adapter 105 for connecting the suction side duct 104 to the airframe suction port 101, In addition, a blow-out adapter 107 that connects the blow-out side duct 106 is disposed at the machine blow-out port 102. A damper type air volume adjusting member 108 is disposed between the airframe outlet 102 and the outlet adapter 107, and the damper type air volume adjusting member 108 includes a slide plate 109 and a guide part 110.

  When the motor 111 is operated, the rotational speed of the impeller of the single suction centrifugal blower 113 is increased with respect to the rotational speed of the motor 111 via the pulley belt 112, and a large air volume can be obtained. Then, the suction air flow 114 inside the machine body 103 passes through the scroll casing 115 and flows out from the discharge port 116 as the discharge air flow 117. Further, it has a function of adjusting the air volume by colliding the discharge airflow 117 with the slide plate 109.

  In general, it is a structure that requires regular adjustment and replacement of the tension of the pulley belt 112 in order to appropriately transmit power and obtain the rotational speed.

(Conventional example 2)
In addition, it is known that the air volume is increased by increasing the rotational speed of the impeller by inverter control. (For example, refer to Patent Document 2).

  The conventional example will be described below with reference to FIG.

  As shown in FIG. 5, first, the blower with a sound deadening box shown in the conventional example 2 has a box-like duct-like body 201, a suction-side duct 203 in the air-suction inlet 202 on the side that sucks in indoor air, and air outside. The blowout side duct 205 is connected to the blower side air outlet 204 and installed. A centrifugal blower 206 is arranged inside the duct-like body 201, and the centrifugal blower 206 includes a casing side plate 210 provided with a discharge port 207, a spiral scroll 208, and a casing suction port 209 on one side. The impeller 211 is driven by a rotation shaft 213 of a motor 212 fixed near the casing suction port 209. In the duct-shaped airframe 201, a partition 216 that partitions the suction-side airflow path 214 and the discharge-side airflow path 215 is provided, and the inverter 217 that also serves as a power supply terminal block for power connection is connected to the air-flow path inside the duct-shaped airframe 201. It is accommodated in the back space 218 of the scroll 208 of the centrifugal blower 206 which is not a part. An inspection opening 219 is provided on the side surface of the duct-shaped airframe 201 facing the motor 212.

  When the centrifugal blower 206 is operated, the power frequency is changed by the inverter 217, the number of rotations of the motor 212 is increased, and a large air volume can be obtained. Then, the airflow passes through the suction side duct 203 and flows along the partition 216 through the suction side air passage 214, passes through the scroll 208 from the casing suction port 209 of the centrifugal blower 206, and then passes through the discharge side air passage 215 along the partition 216. And flows out from the outlet duct 205.

  In general, the life of the inverter 217 is affected by dust and ambient temperature, so that the inverter 217 needs to be regularly maintained and replaced.

(Conventional example 3)
In addition, it is known that two fan units are horizontally arranged in one airframe to increase the air volume. (For example, refer to Patent Document 3).

  The conventional example will be described below with reference to FIG.

  As shown in FIG. 6, the airframe 301 is composed of two pairs of side plates 302 facing each other and an upper surface plate and a lower surface plate, and one of the side surface plates 302 is provided with a body air inlet 304 for connecting the suction side duct 303. The other is provided with a machine body outlet 306 for connecting the outlet duct 305. Then, a partition plate 308 having an opening 307 divides between the side plate 302 on the side of the fuselage inlet 304 and the side plate 302 on the side of the fuselage outlet 306, and the partition plate 308 and the partition plate 308 Between the position restricting member 309 provided on the side plate 302 side on the machine body suction port 304 side, the two centrifugal blowers 311 positioned with the discharge port 310 aligned with the opening 307 of the partition plate 308 are sandwiched. And fixed in parallel. The centrifugal blower 311 can remove the centrifugal blower 311 sequentially from the front by removing the position restricting member 309 through the maintenance opening 312 provided on the side plate 302 side of the machine body 301.

  When the two centrifugal blowers 311 are operated, the air volumes of the two centrifugal blowers 311 merge inside the body 301, and a large air volume can be obtained.

  Generally, the load of the two centrifugal fans 311 is equalized in the airframe 301 and the structure is symmetrical in parallel. Therefore, during maintenance, only the operation check of the centrifugal fan 311-1 close to the maintenance opening 312 is performed. Instead, it is a structure that requires confirmation of the operation of the centrifugal blower 311-2 on the back side by removing the centrifugal blower 311.

JP-A-11-270885 JP 2000-314398 A Japanese Utility Model Publication No. 61-127335

  In such a conventional blower with a sound deadening box, when the air volume is greatly increased, the rotational speed of the impeller is increased by belt driving, the rotational speed of the impeller is increased by inverter control, or in one airframe. Since the two fan units are horizontally arranged, there is a problem that the maintainability of the belt, the inverter, and the plurality of fan units in a narrow ceiling space is poor.

  The present invention solves such a conventional problem, and when forming a blower with a sound deadening box that increases the rotation speed by the inverter and increases the air volume, the inverter is fixed to the maintenance opening side of the fuselage. An object of the present invention is to provide a fan with a sound deadening box that can improve durability while improving workability and maintainability by preventing vibration propagation to the inverter while ensuring maintainability.

In order to achieve the above object, the fan with a sound deadening box of the present invention,
With the opposite sides of the box-shaped airframe as the airframe opening surface, an opening that becomes the airframe inlet and airframe outlet is provided,
A centrifugal blower in which an impeller is directly connected to a rotating shaft of a motor and an inverter for driving the motor are provided inside the airframe,
The airframe is provided with a maintenance opening on the same side as the impeller,
The inverter is housed in an inverter box attached to a side surface of the airframe outlet side of the motor where the maintenance port is provided.

  According to the present invention, there is provided a centrifugal blower in which an opening serving as a machine body suction port and a machine body outlet is provided with the opposite side surfaces of a box-shaped machine body as a machine body opening surface, and an impeller is directly connected to a rotating shaft of a motor inside the machine body. An inverter for driving the motor is provided, and the airframe is provided with a maintenance port on a side surface on the same side with respect to the impeller, and the inverter is closer to the airframe outlet than the motor, and the maintenance port is By placing it in the inverter box attached to the installed side, the airflow from the airframe inlet to the impeller does not collide with the inverter box and the inverter box vibration is reduced, preventing damage to the inverter board due to vibration. Thus, durability can be improved, and an inverter can be arranged on the same side as the motor to improve workability and maintainability.

The side view of the air blower with a silencer box of Embodiment 1 of this invention Top view of the blower with the sound deadening box Side view showing the installation state of the blower with the sound deadening box Plan view of a fan with a sound deadening box of Conventional Example 1 Plan view of a blower with a sound deadening box of Conventional Example 2 Plan view of a blower with a sound deadening box of Conventional Example 3

  The blower with a silencing box according to claim 1 of the present invention is provided with an opening serving as a fuselage inlet and a fuselage outlet with the opposite side faces of a box-shaped fuselage as a fuselage opening surface, and an impeller is provided inside the fuselage. A centrifugal blower directly connected to a rotating shaft and an inverter for driving the motor are provided, and a maintenance port is provided on a side surface on the same side with respect to the impeller, and the inverter is located on the side of the fuselage outlet than the motor. Then, it is stored in the inverter box attached to the side surface provided with the maintenance port, and the airflow from the airframe suction port to the impeller does not collide with the inverter box, so the vibration of the inverter box is reduced, Improve durability by preventing damage to the inverter board due to vibration, and improve the workability and maintainability by placing the inverter on the same side as the motor It is possible.

  In addition, the vibration isolator is placed between the inverter box and the side of the fuselage, and the vibration on the side of the fuselage is difficult to be transmitted to the inverter box. It can be improved.

  In addition, an inverter box cover for preventing dust from entering is provided in the inverter box, and a cooling hole is opened in the inverter box cover, so that heat is trapped while preventing dust from entering the inverter. It can prevent and improve durability.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1 and FIG. 2, the blower with a sound deadening box according to the first embodiment has openings serving as the air inlet 1 and the air outlet 2 on the opposite side surfaces (air opening 3) of the box-like airframe 8. A centrifugal blower 11 and an inverter 13 are built in the body 8. A maintenance opening 6 is provided on one of the side surfaces (the body side surface 7). The centrifugal blower 11 includes a fan casing 20 in which a casing side plate 19 provided with a discharge port 16, a spiral scroll 17, and a casing suction port 18 facing the machine body outlet 2 is arranged on a side surface. In the present embodiment, the centrifugal blower 11 is a double suction type in which the casing suction ports 18 are provided in both of the two casing side plates 19. The impeller 9 is directly connected by a motor 10 and driven.

  The motor 10 is provided on the side surface 7 side of the maintenance opening 6 with respect to the impeller 9. Further, the inverter box 14 is arranged between the motor 10 and the airframe outlet 2 and is attached to the airframe side surface 7 provided with the maintenance opening 6. An inverter 13 that drives the motor 10 is provided inside the inverter box 14.

  Further, the inverter box 14 is attached to the opening provided on the side surface 7 so as to be inserted from the outside. At this time, the front side of the inverter box 14 is formed in a flange shape. When the main body portion is inserted into the airframe 8, the inverter box 14 is fixed to the airframe side surface 7 with screws or the like at the flange-shaped peripheral edge. An anti-vibration material 36 is disposed between the peripheral edge and the machine body side surface 7.

  The inverter box 14 is covered from the outside with an inverter box cover 37 for preventing dust from entering. A cooling hole 38 is opened in the inverter box cover 37.

  As shown in FIG. 3, when the centrifugal blower 11 is operated, the air in the room 25 is sucked from the suction side duct 26, passes through the centrifugal blower 11, and is exhausted from the blowout side duct 27 to the outdoors 28 via the fuselage outlet 2. Is done. The airframe 8 is installed in a ceiling 30 separated from the room 25 by a ceiling 29, and the ceiling 29 is provided with a ceiling inspection port 31 for maintaining the motor 10 from the side through the maintenance opening 6. .

  The operation will be described in more detail. As shown in FIG. 2, in the airframe 8, the airflow 35 sucked from the airframe suction port 1 is sucked into the fan casing 20 of the centrifugal blower 11 from the casing suction port 18. At this time, since the casing suction port 18 is located closer to the fuselage suction port 1 than the inverter box 14, the airflow inside the fuselage 8 is sucked into the casing suction port 18 without directly colliding with the inverter box 14. is there.

  That is, since the airflow 35 inside the machine body 8 does not collide with the inverter box 14, the vibration of the inverter box 14 is reduced, and damage to the substrate of the inverter 13 due to vibration can be prevented and durability can be improved.

  In addition, since the vibration isolator 36 is disposed between the inverter box 14 and the fuselage side surface 7, the vibration of the fuselage side surface 7 is difficult to be transmitted to the inverter box 14. Can be improved. Note that it is desirable to use a rubber material or a foaming material such as urethane for the vibration isolator 36 because the structure can be simplified.

  Further, the inverter box 14 is covered with the inverter box cover 37 and the cooling hole 38 is opened in the inverter box cover 37, so that heat can be stored while preventing dust from entering the inverter 13. To prevent. Therefore, the substrate of the inverter 13 can be prevented from being damaged and the durability can be improved. The fact that the inverter box cover 37 with the cooling hole 38 opened is on the side surface 7 of the airframe means that the cooling hole 38 is in the event of water falling down on the top surface 4 side of the body due to a water leakage accident in a building. This makes it difficult for water to penetrate from the water and protects the inverter.

  Thus, according to the air blower with a silencer box of Embodiment 1 of this invention, durability can be improved, improving workability and maintainability.

  In addition to the purpose of air conveyance such as ventilation blower equipment, the equipment can be cooled using the exhaust structure, and can be applied to the use of equipment equipment that can be installed compactly.

DESCRIPTION OF SYMBOLS 1 Airframe inlet 2 Airframe outlet 3 Airframe opening surface 4 Aircraft top surface 5 Aircraft bottom surface 6 Maintenance opening 7 Airframe side surface 8 Aircraft 9 Impeller 10 Motor 11 Centrifugal blower 13 Inverter 14 Inverter box 36 Anti-vibration material 37 Inverter box cover 38 Cooling hole

Claims (3)

With the opposite sides of the box-shaped airframe as the airframe opening surface, an opening that becomes the airframe inlet and airframe outlet is provided,
A centrifugal blower in which an impeller is directly connected to a rotating shaft of a motor and an inverter for driving the motor are provided inside the airframe,
The airframe is provided with a maintenance opening on the same side as the impeller,
The inverter is a blower with a muffler box housed in an inverter box attached to a side surface provided with the maintenance port on the side of the airframe outlet from the motor. The blower with a sound deadening box according to claim 1, wherein a vibration isolating material is disposed between the inverter box and the side surface of the machine body. The blower with a sound deadening box according to claim 1 or 2, wherein an inverter box cover for preventing dust intrusion is provided in the inverter box, and a cooling hole is opened in the inverter box cover.

Images